Estimating directional derivative?

[mrjust]

I'm in the third semester of Calculus, and currently learning about Gradient and Directional derivatives in the plane. I have no idea how to go about doing this, I got it wrong 19 times so far.

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[Deleted member 4993]

I'm in the third semester of Calculus, and currently learning about Gradient and Directional derivatives in the plane. I have no idea how to go about doing this, I got it wrong 19 times so far.

Click thumbnail for larger image

Please share one of your 19 attempts with us ...

If you are stuck at the beginning tell us and we'll start with the definitions.

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